Ara es mostren els items 1-20 de 26

  • An OFDMA-PON with non-preselected independent ONU sources and centralized feedback wavelength control: Dimensioning and experimental results 

    Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Escayola Elias, Francisco Javier; Polo Querol, Víctor; Giacoumidis, E.; Kachris, C.; Tomkos, Ioannis; Prat Gomà, Josep Joan (IEEE, 2012)
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    A simple and low cost method for wavelength control based on centralized OLT monitoring and feedback of economical random non-preselected independent ONU sources is presented. The technique was dimensioned and experimentally ...
  • A study of flexible bandwidth allocation in statistical OFDM-based PON 

    Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Peralta Gallardo, Ángel; Polo Querol, Víctor; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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    The upstream of an OFDM-PON with direct modulated lasers tuned in temperature was experimentally tested. Results demonstrate flexible bandwidth allocation, and show it constitutes an efficient strategy to cope with the ...
  • Bandgap widening in macroporous silicon photonic crystals by multiperiodic structures 

    Segura García, Daniel; Cardador Maza, David; Vega d'Aurelio, Davide; Santos Blanco, M. Concepción; Dios Otín, Víctor Federico; Rodríguez Martínez, Ángel (Institute of Physics (IOP), 2018-05-14)
    Article
    Accés obert
    Large bandgaps with low transmission in 3D macroporous silicon photonic crystals have been proved as an interesting technology for the development of optical filters and spectroscopic MIR gas sensors. The aim of this study ...
  • Bandwidth-length trade-off figures of merit for electro-optic traveling wave modulators 

    Ibarra Fusté, Jose Antonio; Santos Blanco, M. Concepción (2013-05)
    Article
    Accés obert
    Closed-form expressions explicitly relating modulation bandwidth and active length in electro-optic traveling wave modulators are presented which fully account for skin-effect electrode loss and optical-electrical wave ...
  • Closed-form expressions for the optimization of high speed electro-optical modulators 

    Ibarra Fusté, Jose Antonio; Santos Blanco, M. Concepción (2013-07)
    Article
    Accés restringit per política de l'editorial
    Compact closed-form mathematical expressions for the propagation parameters (characteristic impedance, effective permittivity and attenuation) of coplanar waveguides (CPW) are presented. The formulas take into account ...
  • Compact closed-form expressions for the propagation parameters of a finite ground width coplanar transmission waveguide with thick electrodes 

    Ibarra Fusté, Jose Antonio; Santos Blanco, M. Concepción; Rodríguez Rodríguez, Enric (2012-02-21)
    Article
    Accés restringit per política de l'editorial
    Compact closed-form mathematical expressions are presented for the effective permittivity, characteristic impedance and attenuation constant of coplanar waveguides with thick electrodes and high-frequency dispersion. ...
  • Conmutacion totalmente optica de ondas guiadas en medios virefring. 

    Santos Blanco, M. Concepción; Pérez Torres, Juan; Torner Sabata, Lluís (1993)
    Text en actes de congrés
    Accés obert
    A new kind of tunable all-optical guided-wave thresholding device using waveguides consisting of both birefringent linear media and isotropic nonlinear media is discussed. The behavior of the lower threshold with a suitable ...
  • Differential link-loss compensation through dynamic bandwidth assignment in statistical OFDMA-PON 

    Cano Valadéz, Iván Nicolás; Peralta Gallardo, Ángel; Polo Querol, Víctor; Escayola Elias, Francisco Javier; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (2013)
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    Flexible bandwidth allocation strategies in a statistical OFDM-PON are experimentally shown to compensate for differential link loss allowing for proper detection of ONUs separated up to 55km (11.4dB)
  • Dynamic Y-branched structures in quadratic nonlinear media 

    Santos Blanco, M. Concepción (ELSEVIER SCIENCE BV, 2000-06-30)
    Article
    Accés obert
    A selfsplitting of the beams entering a waveguide made of a quadratic nonlinear material is observed numerically. Relative π phase differences between harmonics as positively contributing to linear diffraction are shown ...
  • Experimental demonstration of a statistical OFDM-PON with multiband ONUs and elastic bandwidth allocation 

    Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Schindler, Philipp C.; Santos Blanco, M. Concepción; Polo Querol, Víctor; Leuthold, Juerg; Tomkos, Ioannis; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2015-01-01)
    Article
    Accés obert
    The statistical orthogonal frequency division multiplexing passive optical network (OFDM-PON) concept with multiband optical network units (ONUs) is experimentally tested with two users and an optical line terminal at 2.5/5 ...
  • Experimental demonstration of multi-band upstream in statistical OFDM-PONs and comparison with digital subcarrier assignment 

    Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Schindler, Philipp C.; Santos Blanco, M. Concepción; Polo Querol, Víctor; Leuthold, Juerg; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    A multiband subcarrier allocation scheme is demonstrated for the uplink in a statistical OFDM-PON. Performance achieved is similar to digital subcarrier allocation, with the significant advantage of a lower transmitter complexity.
  • Figure of merit for multiband antennas 

    Rius Casals, Juan Manuel; Santos Blanco, M. Concepción; Parrón Granados, Josep (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-11-30)
    Article
    Accés obert
    This communication defines a figure of merit for multiband antennas that gives an objective quantification of the similarities between radiation patterns at the different antenna operating bands.
  • General Equations for the Induced Phase Shift in Resonant Electro-Optic Modulators 

    Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; Santos Blanco, M. Concepción; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-02-28)
    Article
    Accés obert
    We derive general equations to calculate the electrooptically induced optical phase shift in resonantly enhanced modulators. The equations are useful in designing modulator electrodes with optimal length and optimal mismatch ...
  • La fotònica revoluciona les telecomunicacions 

    Torner Sabata, Lluís; Pérez Torres, Juan; Artigas García, David; Santos Blanco, M. Concepción (1998-12)
    Article
    Accés obert
  • Laser linewidth requirements for remote heterodyne OFDM based PON scenario 

    Escayola Elias, Francisco Javier; Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (IEEE Press and Wiley, 2004)
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    The relationship between the FFT size, modulation format and laser linewidth is studied in a remote heterodyne scenario where phase noise is compensated by pilot tones. Results indicate that the laser linewidth tolerance ...
  • New modulation zero-shift method to characterize fast group delay ripple of dispersion-compensating fiber Bragg gratings 

    Santos Blanco, M. Concepción; Bernardo Rodi, Santa Patricia de; Mitre Gutierrez, Marco Antonio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-09-30)
    Article
    Accés obert
    An upgrade to standard modulation phase-shift method is shown to improve accuracy through electrical scan of the optical spectrum. Experiments have allowed the capture of fast group delay ripple of a dispersion-compensating ...
  • OFDM-PON performance with limited quantization 

    Escayola Elias, Francisco Javier; Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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    A study of digital-analogue converter quantization effects and the minimum resolution required in an OFDMA-PON is carried out with 10 Gbps transceivers. The PON is based on DD over a maximum of 100 km fibre length. Results ...
  • Optical solitons in quadratic nonlinear media and applications to all-optical switching and routing devices 

    Santos Blanco, M. Concepción (Universitat Politècnica de Catalunya, 1998-03-02)
    Tesi
    Accés obert
    Esta tesis constituye un estudio detallado y exhaustivo de las propiedades de una variedad específica de ondas ópticas solitarias. Observadas experimentalmente por primera vez en 1995, estas ondas estan formadas por un ...
  • Optimum carrier to signal power ratio for remote heterodyne DD-OFDM in PONs 

    Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (2013-07)
    Article
    Accés restringit per política de l'editorial
    The carrier to signal power ratio (CSPR) in a directdetection optical orthogonal frequency division multiplexing (OFDM) system based on remote heterodyne scheme is optimized in a passive optical network (PON) downlink. ...
  • Optimum CSPR evaluation of heterodyne envelope receivers in OFDM-PONs 

    Behnam Shariati, Mohammad; Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    A heterodyne envelope (HE) receiver (RX) is investigated in the context of orthogonal frequency division multiplexing (OFDM) passive optical networks (PONs). Impacts of limited roll-off factor of shaping filter and required ...